compiler-rt/test/tsan/libdispatch/barrier.c

   1 // RUN: %clang_tsan %s -o %t
   2 // RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
   3
   4 #include "dispatch/dispatch.h"
   5
   6 #include "../test.h"
   7
   8 long global;
   9
  10 int main() {
  11   fprintf(stderr, "Hello world.\n");
  12   dispatch_semaphore_t done = dispatch_semaphore_create(0);
  13   barrier_init(&barrier, 2);
  14
  15   dispatch_queue_t q = dispatch_queue_create("my.queue", DISPATCH_QUEUE_CONCURRENT);
  16   dispatch_queue_t bgq = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
  17
  18   dispatch_async(bgq, ^{
  19     dispatch_sync(q, ^{
  20       global = 42;
  21     });
  22     barrier_wait(&barrier);
  23   });
  24
  25   dispatch_async(bgq, ^{
  26     barrier_wait(&barrier);
  27     dispatch_barrier_sync(q, ^{
  28       global = 43;
  29     });
  30
  31     dispatch_async(bgq, ^{
  32       barrier_wait(&barrier);
  33       global = 44;
  34     });
  35
  36     barrier_wait(&barrier);
  37
  38     dispatch_semaphore_signal(done);
  39   });
  40
  41   dispatch_semaphore_wait(done, DISPATCH_TIME_FOREVER);
  42   fprintf(stderr, "Done.\n");
  43 }
  44
  45 // CHECK: Hello world.
  46 // CHECK: Done.